<template>
  <view>
    <!-- 使用自定义组件 -->
    <my-search @click="gotoSearch"></my-search>
    <view class="scroll-view-container">
      <!-- 左侧的滚动视图区域 -->
      <scroll-view class="left-scroll-view" scroll-y :style="{height: wh + 'px'}">
        <block v-for="(item,i) in cateList" :key="i">
        <view :class="['left-scroll-view-item ',i===active?'active':'']" @click="changeActive(i)">{{item.cat_name}}</view> 
        </block>
      </scroll-view>
     <!-- 右侧的滚动视图区域 -->
     <scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrolltop">
       <block class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
         <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
         <!-- 动态渲染三级分类的列表数据 -->
         <view class="cate-lv3-list">
           <!-- 三级分类 Item 项 -->
           <navigator class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" :url="'/subpkg/goods_list/goods_list?cid='+item3.cat_id">
             <!-- 图片 -->
             <image :src="item3.cat_icon"></image>
             <!-- 文本 -->
             <text>{{item3.cat_name}}</text>
           </navigator>
         </view>
       </block>
     </scroll-view>
    </view>
  </view>
</template>

<script>
  export default {
    data() {
      return {
        wh:0,
        active:0,
        scrolltop:0,
        cateList:[],
        cateLevel2:[]
      };
    },
    onLoad(){
      //获得当前设备信息
      const sysInfo=uni.getSystemInfoSync()
 // 可用高度 = 屏幕高度 - navigationBar高度 - tabBar高度 - 自定义的search组件高度
 this.wh = sysInfo.windowHeight - 50
       // 调用获取分类列表数据的方法
        this.getCateList()
         
  
    },
    methods:{
     async getCateList(){
        const{data:res}=await uni.$http.get('/api/public/v1/categories')
        if(res.meta.status!==200) return uni.$showMsg()
        this.cateList=res.message
        //为二级分类赋值
        this.cateLevel2=res.message[0].children
      },
      changeActive(i){
        this.active=i,
        this.cateLevel2=this.cateList[i].children
        this.scrolltop=this.scrolltop===0?1:0
      },
      gotoSearch(){
        uni.navigateTo({
          url:'/subpkg/search/search'
        })
      },
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
}
.left-scroll-view{
  width: 120px;
}
.left-scroll-view-item{
  background-color: #F7F7F7;
  line-height: 60px;
  text-align: center;
  font-size: 12px;
  
  &.active{
    background: #FFFFFF;
    position: relative;
    &::before{
      content: '';
      display: block;
      width: 3px;
      height: 30px;
      background-color: #C00000;
      position: absolute;
      top:20%;
      left: 0;
    }
  }
}
.cate-lv2-title {
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
}
.cate-lv3-list {
  display: flex;
  flex-wrap: wrap;

  .cate-lv3-item {
    width: 33.33%;
    margin-bottom: 10px;
    display: flex;
    flex-direction: column;
    align-items: center;

    image {
      width: 60px;
      height: 60px;
    }

    text {
      font-size: 12px;
    }
  }
}
</style>
